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TIL Bill Gates Has Donated More Than $50 billion to Charity

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O9Ga TIL billionaire Howard Hughes bought the small Silver Slipper casino only to re-position the hotel’s trademark neon sign, which was visible from his bedroom and had been keeping him up at night.
9w17 TIL: Keys available on eBay could give terrorist full access to NYC skyscrapers, subway, firehouses, construction sites and street lamps - NYPOST.com
P6yO TIL Tom Ryan invented Jif Peanut Butter, Pizza Hut’s double-stuffed pizza, the McGriddle, McDonald’s fruit & yogurt parfait, Smashburger, the Meat-lovers Pizza and McDonald’s entire Dollar Menu.
J1BR8 TIL During the Second Punic War, it's been suggested that upwards of 300,000 Roman soldiers were killed by Hannibal's army. At the Battle of Cannae alone, about 20% of Rome's fighting age men were killed (up to 70k), and by the end of the war, 1 in 6 of Rome's adult male population was dead.
wLP0W TIL that if you add 250ml of ethanol to 250ml of water, you get less than 500ml of liquid. This is because strong hydrogen bonding draws the different molecules closer together, and because ethyl molecules interfere with any open spaces in the water, causing them to pack closer together.